Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Materiale di riferimento-it#Sense
Referenzmaterial-de#Sense
Referentiemateriaal-nl#Sense
Referenciaanyag-hu#Sense
Referencestof-da#Sense
Material de referência-pt#Sense
Material de referencia-es#Sense
Etalonaine-et#Sense
Material de referință-ro#Sense
MR-ro#Sense
Materiał odniesienia-pl#Sense
Referenčný materiál-sk#Sense
Reference material-en#Sense
Υλικό αναφοράς-el#Sense
Matériel de référence-fr#Sense